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Baseflow recession characterization and groundwater storage trends in northern Taiwan

机译：台湾北部的基流衰退特征和地下水储存趋势

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摘要

Groundwater is a critical component of the terrestrial water budget and acts as a relatively stable water source in Taiwan, In the present study, river basins' characterization and groundwater storage trends in northern Taiwan are analyzed using the Brutsaert method. As groundwater storage sustains baseflows in a water system during dry periods, it can be assessed directly from the streamflow record. The characteristic drainage time scale value, K, varied between 34 and 84 days, with a mean value of 54 days and a standard deviation of 16 days. From correlation analysis, K is strongly correlated with the main channel slope. Based on annual values of groundwater storage over the period of record, five subbasins showed downward trends, ranging from -0.053 to -0.950 mm/year, and three subbasins exhibited upward trends, ranging from 0.111 to 0.141 mm/year. During the period of 2000-2014, the groundwater storage trends in northern Taiwan had an obvious spatial distribution. River basins with significant negative trends (mean value of -2.729 mm/year) are located in the northeast part of the study area. In contrast, the subbasins in the northwest part all showed positive trends (mean value of 0.944 mm/year) in groundwater storage.
机译：地下水是台湾陆地水量的重要组成部分，是台湾相对稳定的水源。在本研究中，使用Brutsaert方法分析了台湾北部河流域的特征和地下水储量趋势。由于干旱期间地下水的存储维持水系统中的基本流量，因此可以直接从流量记录中进行评估。特征性排水时间标度值K在34至84天之间变化，平均值为54天，标准偏差为16天。通过相关分析，K与主通道斜率高度相关。根据记录期间的年地下水存储量，五个子流域呈下降趋势，范围从-0.053至-0.950 mm /年，三个子流域呈上升趋势，范围从0.111至0.141 mm /年。在2000-2014年期间，台湾北部的地下水蓄积趋势具有明显的空间分布。具有显着负趋势（平均值为-2.729毫米/年）的流域位于研究区域的东北部。相比之下，西北部的子盆地在地下水存储方面都呈现出积极的趋势（平均值为0.944毫米/年）。

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